Fundraising Thank You return page

On the return page after paypal donation getting the message “Oh No, we can’t find your Pledge” I waited and tried refreshing, same message.

I’m on a test server using paypal sandbox, but I get the same message from production. On the test server I have turned off all plugins and changed the theme to 2010 and deactivated buddypress.

On test server:

Running WordPress: 3.3.2

Fundraising: 2.1

Theme: Twenty Ten

Thanks in advance for your help